Sci fi help for UFO encounter?

[Uncertainperson]

At school I have to make movie about 10 min ,and I have to make the movie based on a UFO sighting
Anyone have any ideas and the UFO has to be believable and I don't want to have to use digital editing?

 

[Fitz]

You don't actually have to show the UFO at all. Show your characters looking in the sky, shine extremely bright flood lights on their faces, have the car lose power.

Often the best part of a film is not what you see, but what you don't see that your imagination can do for itself.

-edit-
For example: The X-Files. Here's something they did real similar to my suggestion.
http://images4.wikia.nocookie.net/__cb20120717034561/x-files/images/8/81/Dana_Scully_Pilot_End.png

Here's another I found in Google Images:
http://wpcdn.promonews.tv/wordpress/wp-content/uploads/2012/06/PromoNews5.jpg

 

[Nyx]

Ask over on a home made movie forum -
http://oneseventeenmedia.wordpress.com/2009/12/21/filmmaking-tips-homemade-special-effects/